I suspect that you could have some tip stall problems at low speed with that wing... watch the ratio between tip and root chords.
I also strongly suggest that you make a weight and balances charts in order to place the wing properly and to recalculate better the tail volumes; also it could help to stimate final weight of the ship.
Cheers!!!!

Guille

PS: may be Mr. Daniel Raymer and his book could give some advices too!!!